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About keychange

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  1. Montesa Cota 247 kickstart spring

    The spring has to have some loading on it otherwise it will flop around. The kick start is usually installed at around 2 o'clock rather than vertical. I have only had one spring break and that was when my son tried starting with the clutch in
  2. Montesa Cota 247 Break In Period

    Normally you can't apply a new sealer over an old sealer and it can be a big job removing the old stuff. Wait until you can see what is there as long as the original sealing job was done correctly it should be fine.
  3. Montesa Cota 247 Break In Period

    Take it easy in terms of long downhill runs for a few hours...but apart from that standard trials type riding is pretty ideal for engine break in ...but avoid labouring the engine ie: pulling away in a gear that is too high. I would also suggest that you get an after-market compression release - as the starter gear is very vulnerable and difficult to obtain. I run 25:1 and castrol VMX80 in the gear box. Some guys recommend ATF but my 76 model jumps out of gear in every gear and false neutrals everywhere. With VMX it only jumps out for first, occasionally 2nd but no false neutrals. I am guessing that yours is around a 75 model - engine number should tell you.
  4. TDC indicator tool,point setting?

    I have a 247 and could never get a good outcome with 2.5 mm measure (for the 247) - once I switched to using a paper timing disc it was perfect and hasn't been touched in last 5 years.
  5. 247 bash plate

    This small one was on mine when I got it - it protects the case covers but leaves the frame exposed as it is fitted above the frame. I have broken the frame on rocks so I got a guy to cut out a sheet of aluminium plate and I bent it into shape. Problem engine sat lower without original and when I measured it up for new one I forgot to allow for the cases and so I ended up with both. Sorry I don't have a recent shot with both.
  6. Cota 247 Motoplat Ignition Set-Up... Clueless!

    https://www.speedandsport.com/index.php/parts/ignition-lighting/ignition-coil/ $18USD - I have one and it works perfectly. It took me 6 months to get my Cota working reliably, very frustrating but that was 10 years ago and it has been fantastic ever since. I haven't touched the points since then either. PS - make sure coil is bare metal to metal earth
  7. Cota 247 Motoplat Ignition Set-Up... Clueless!

    I cut all wires from auxilary stators just in case they were shorting. The engine seals would have to be totally stuffed for it not to fire at all.....again compression and leak test would confirm. Likewise timing would have to be out to buggery like 180 degrees. So almost certainly you have electrical issue causing very weak spark. There is only a few parts involved, remind me did you replace the coil - pick up a cheapie on ebay.
  8. Cota 247 Motoplat Ignition Set-Up... Clueless!

    Did you try the starter spray ? Aerostart or whatever as that will decide if problem is fuel, or electrical
  9. Cota 247 Motoplat Ignition Set-Up... Clueless!

    Personally I think 50:1 is not a good idea on an old engine - the old bearing aren't remotely comparable to modern engines. You may have to lean off the mixture as you are delivering 2% more fuel ..not sure if that is significant or not. That oil "is for use in modern, high speed, high performance 2-stroke engines." I would seek advice as to how suitable for an old, low performance, piston port engine.
  10. Cota 247 Motoplat Ignition Set-Up... Clueless!

    Ok so you have spark and even if the timing wasn't perfect it should fire unless it is too advanced so err on retarded if you check again. The 247 doesn't have much if any gear reduction on the kick starter and is notoriously hard to kick and easy to bugger the starter gear ( which you cannot find replacements for ). I use a decompression valve on the spare plug. I have an old Yamie XT250 with no decompression valve and Cota takes twice as much kick as the Yammie .. So your assumption that compression is good just based on kick strength may not be correct. I assume you have tried a fresh plug - even if it looks perfect and I repeat the gap is critical 0.4mm as the old ignition system can't throw a spark any further when under compression - so just because you have spark with plug removed does not mean it will spark when installed. My 247 can be hard to start when cold - so after a couple of tickles I turn fuel off so as not to soak the plug. It can take 20 kicks to fire when cold ( decompression valve invaluable ) but once warm will generally start first kick. Why not try some starter spray just to see if it fires - then you will know if fuel/carbie is the issue.
  11. Cota 247 Motoplat Ignition Set-Up... Clueless!

    Does it run at all or completely dead? They are very basic machines - so start with the basics - is it fuel or is it spark. If it is spark - is there any spark at all? If there is spark is it strong enough - make sure yo have gap correct ie: standard plug setting is too wide If it's fuel and it won't kick at all - then what have you done already ... the Amal is notorious but once set up correctly it will run for years Other things to check are compression and leak down - engine seals are a common problem.
  12. Cota 247 Motoplat Ignition Set-Up... Clueless!

    You asked " should the wire that runs to the live side of the coil read as shorted to earth at any point? " well yes when the points are closed ...that's why they are called breaker points.
  13. Cota 247 Motoplat Ignition Set-Up... Clueless!

    If the points are ok then check condenser ( just disconnect from frame ) as a faulty one could short to earth as could a buggered coil.
  14. Cota 247 Motoplat Ignition Set-Up... Clueless!

    Make sure your points aren't earthed when open - if they are you haven't installed the insulator on the pivot correctly
  15. Cota 247 Motoplat Ignition Set-Up... Clueless!

    Well that'll do it